Week one
The first week of pregnancy is actually classed as the week after your last period. You haven't even ovulated yet! The baby-to-be really is still just a twinkle in your partner's eye at this stage.
Week two
Ovulation usually happens around the end of week two or at the start of week three, and then... conception! Sperm meets egg and a zygote is formed. It heads off towards the uterus down the fallopian tube.
Week three
The cells multiply on the journey. Once they settle into the wall of the uterus the embyonic stage has begun. The embryo is still very tiny. It would fit on a pin head! The placenta now starts to grow.
Week four
Amazingly, the body's main organs have already started to grow. The heart is forming into chambers and beginning to beat, although it doesn't have a regular rhythm yet. If you could have a peek inside your womb, you'd maybe be able to spot the embryo; it is a few millimeters long.
Week five
A number of blood vessels have formed and the nervous system and brain start to develop around this time too. The embryo doesn't look anything like a baby so far, it resembles a tadpole with a big head instead!
Week six
By the end of week six the embryo should be a bit bigger than a grain of rice. Tiny lumps originate where the arms and legs will appear. The face starts to develop its shape with bumps, dents and holes where different features will eventually be.
Week seven
There is a lot going on in there! The beginnings of teeth appear and fingers and toes start to develop. Those fingers and toes will be webbed for a few weeks. Movement can often be seen on an ultrasound by the end of week seven.
Week eight
About the size of a bean, the embryo's tail is now disappearing and the body starts to look more straightened out. All the internal organs are present and they all start to do their jobs! Bones are developing as the limbs grow longer.
Week nine
Muscles have become strong enough to move the arms and legs of the embryo around this time. Skin starts to develop into two layers. The placenta is cleaning away waste, and is making food for your future child along with hormones.
Week ten
By the end of this week your embryo turns into a foetus. Fingernails start to grow, as well as taste buds in the tongue. Blood is being made and pumped around the body. Downy hair starts to grow from new hair follicles.
